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BMP-Based Target Setting for California's Water Conservation Goals

This presentation by DWR at the U4 Technical Subcommittee Meeting on August 25, 2010, discusses the BMP-based approach for setting water conservation targets in California. It highlights the statewide baseline of 192 GPCD, with a required target of 154 GPCD—an essential reduction of 38 GPCD by 2020. The presentation outlines the objectives of the 20x2020 study, potential savings from various measures, and the methodologies used for quantifying these savings. Ultimately, it aims to ensure California meets its mandated water conservation goals while considering conservation, population density, weather, and unaccounted water.

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BMP-Based Target Setting for California's Water Conservation Goals

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  1. BMP-Based Target Setting Presented by DWR at U4 Technical Subcommittee Meeting on August 25, 2010

  2. Baseline and Targets • Statewide baseline estimated by 20x2020 report • 192 GPCD • Required target, 80% of baseline • 154 GPCD • Reduction required by 2020 • 38 GPCD

  3. Why BMP-Based Targets? • Takes into account • Prior conservation • Population density and weather • CII intensity • Unaccounted for water • Savings data available from the 20x2020 study to design the approach and ascertain statewide savings

  4. Objectives of the 20x2020 Study • Assess whether California can achieve a 20% reduction in per-capita use by 2020 • Identify the mix of measures and approaches required to reach above goal • The study goes beyond BMPs to identify potential sources of savings

  5. Sources of Savings in the 20x2020 Study • Water Use Efficiency Comprehensive Evaluation (WUECE) used to develop savings estimates • Savings under Basic Measures capture • plumbing codes, cost-effective and grant funded BMPs, their interactive effect, plus ET controllers • Savings under Additional Measures capture • Impact of exceeding BMP coverage goals • Lower levels of unaccounted for water • Irrigation restrictions • Recycling and CII PBMPs

  6. Table 7 From 20x2020 Report

  7. Our Approach to the Problem • Identify BMPs that are easily quantifiable • or simplify the quantification method relative to what was used in the WUECE • Assess whether selected BMPs achieve the 20% savings goal by 2020 • If not, evaluate the impact of Additional Measures • Develop an overall scaling factor to ensure state reaches its mandated goal

  8. Exploratory Analyses Suggest… • Models and data exist to quantify the impact of most BMPs • CII savings will be quantified as 10% of baseline CII GPCD. WUECE’s methods were more complex • Increasing coverage goals in some instances is desirable • It raises savings, preserves equity, and simplifies the calculation methodology

  9. Components of the Savings Calculation • BMP 1.2 Water Loss Control • Savings shall be calculated on the basis of reaching a loss goal <=40 gals/conn/day (from Additional Measures in the 20x2020 report) • BMP 1.3 Metering • Assume all urban connections are metered prior to 2020: savings 20% of pre-metered use • BMP 3.1 Residential Assistance Program • Estimate savings potential without including LF showerheads in the calculation: 8.8-21 gpd (mf/sf) at 15% decay

  10. Components of the Savings Calculation • BMP 3.2 Residential Landscape Surveys • Evaluate savings potential per the MOU: 15% savings at 10% annual decay • BMP 3.3 High Efficiency Clothes Washers • 14.4 gpd savings; washer life 14 years; 10% freeridership • BMP 3.4 WSS toilets • Savings depends on toilet type, program type, and location: see BMP database document

  11. Components of the Savings Calculation • BMP 4 Commercial, Institutional, Industrial • Estimate savings as 10% of baseline CII GPCD • BMP 5.1 Water budgets for dedicated irrigation • Evaluate savings potential per the MOU: 19% savings at 10% annual decay • BMP 5.2 Landscape surveys for mixed use CII accounts • Captured in BMP 4

  12. Components of the Savings Calculation • For WSS, CII urinals, LF showerheads and HE clothes washers calculate savings potential based on assumed 2020 saturation goals • Saturation of 3.5 (or greater) g.p.f. toilets <= 5% by 2020 • Saturation of non-efficient CII urinals <= 5% • Saturation of non-LF showerheads <= 5% • Saturation of (WF=6) HE clothes washers >= 85%

  13. Model and Data Requirements • Models to estimate saturation rate of residential and CII WSS, LF showerheads, urinals and HE clothes washers at midpoint of baseline already exist • These models factor in the effect of plumbing codes and past active programs • Unit savings assumptions from the MOU • Data and methods already exist in the MOU for evaluating the remaining BMPs

  14. How Does the Approach Work Statewide • The 20x2020 models suggest that our calculation approach reduces 2020 usage by 36 GPCD • This is after including a correction for the simplified CII savings methodology we are proposing relative to the WUECE • The target derived from the proposed calculations would be further lowered by 2 GPCD to ensure state reaches its goal

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